In which any evidence admitted or discovered in his case would become potential admissable evidence that could be leveraged in the Fed's criminal probe as a matter of public record. And since it was a defamation suit, his entire history was discovery fodder with a much lower bar to cross for subpoena's or discovery than the criminal probe would be. Then there's potential leaksge to the media and public (and thereby regulators) of exactly what to look for.

Don't stop thinking at the first order consequence/event. There is generally much more to it.